What kind of water is used in flue gas desulfurization towers?
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I would like to ask the experts: what kind of water is used in flue gas desulfurization towers? Is there purified water that has been treated using acidic steam stripping?
Flue gas desulfurization towers typically use circulating water or purified water. Treated acidic water may be used in some situations, but this needs to be determined based on the specific requirements of the facility and the process. .
The purified water obtained after acidic water stripping is generally used for electrodesalination in atmospheric and vacuum distillation units. For the water used in flue gas desulfurization towers, we employ water that has passed through reverse osmosis membranes in wastewater treatment plants (which we refer to as reclaimed water)
Some also use fresh water, but its use can easily lead to scaling in pipes, valves, pumps, and other components, making subsequent treatment quite troublesome
It is certainly not possible to use the purified water obtained through acidic vapor stripping; this water contains unstripped sulfur, volatile phenols, organic substances, and ammonia, all of which are still considered pollution factors. Using such water in flue gas desulfurization processes leads to emission problems. The vaporization process generates odors, and the accumulation of organic substances in the desulfurization tower causes foaming, scaling, and blockages of the foam breakers. The flue gas then carries catalyst particles with it, leading to contamination, reduced oxidation efficiency of the wastewater, and high COD levels.
The treated water we use contains no organic matter in inorganic chemical processes; therefore, it’s relatively simple to handle
Previously fresh water was used; as explained later, by reinjecting some treated water, the COD level increased significantly and the slurry acquired an unpleasant odor. The emissions of clean flue gas met the standards, and no significant drawbacks have been observed for now； As for the nozzle, it needs to wait until maintenance for inspection.
No, our reclaimed water is treated using reverse osmosis membranes; the wastewater discharged from the treatment plant cannot be used directly as it will corrode the pipelines.
What is the price per cubic meter for water recycling among you?
The type of water to be used ultimately depends on the chloride content in it. Currently, composite towers are mostly made of stainless steel, but corrosion poses a problem over the long term.